Seventeen soldiers should be left after the first 3-man team is eliminated, but Todd kills a total of 24 soldiers.
When Col. Mekum first enters the hanger, the aftermath of the chain fight (which hasn't occurred yet) is clearly visible.
After Cain exits his broken vehicle, he is bleeding from his left shoulder. In the next scene he is bleeding from the right shoulder, and his left shoulder is uninjured. In a later scene, he again bleeds from his left shoulder, with his right shoulder uninjured.
Early in the film, when the young boys are running, the boy lagging behind is wearing a shirt soaked with sweat. When the trainers pull up to shoot him, his shirt is dry.
When young Nathan plays on the rug, he has a puzzle that he doesn't receive until the Christmas party in a following scene.
The snakes shown in the combat are not vipers. They are boa snakes, which constrict. They would not have done any harm to the soldier when Todd pulled him over on to the ground.
When Todd and Nathan are looking out the window at the end, they wonder at a galaxy in the distance which is slowly rotating. Spiral galaxies such as the Milky Way take hundreds of millions of years for a complete rotation, not minutes. It's unclear which galaxy is portrayed, but no galaxies beyond the Milky Way are visible with the naked eye; they are too faint. If the galaxy is supposed to be the Milky Way, Arcadia must implausibly be millions of light years away from Earth.
At 19:22, when Todd, presumed dead, was getting dumped to the waste disposal planet, there is wide shot of the planet's surface with its star and two moons visible. The camera is showing the star, that means both the moons have their other sides towards the star, that other side would have day, and the side facing the camera would be opposite to the star, not getting any light, it would be night there and none of the either moon would be at all visible. But, both the moons are shown bright full moons. That is not possible unless there are more stars behind the camera which are throwing light to these two moons.
Todd fires a rocket launcher which hits the enemy soldier, but it doesn't explode until the enemy has flown out the window and landed on the ground.
When the challenge on the chains is finished, the Col shoots one of the dead soldiers hanging upside down in the head. The bullet exists the skull through the forehead, but the hole is not a proper exit wound. It should have been larger and had more damage.
When Todd rises from the water, ready to shoot, the ripples, lack of water falling from his body, and fire in the background show that the shot was played in reverse.
Every time Todd hit the enemy troops with a round, they always died, their armor did nothing to protect them.
When Todd is punching a gas tank, most of the impacts sound like a fist against a metal tank, but it collapses and rebounds like a stuffed bag. Close-up shots of his fists show a piece of metal.
In the beginning, when Sgt. Todd and Caine are running, lighting trucks are visible beyond the plastic sheeting covering parts of the hallway.
In the montage of Todd's training, during a run an obese boy falls behind and is killed on the spot. Considering how every aspect of the soldiers' lives is so tightly regimented, the boy should have never gotten overweight.
The reason for the advance troops being on a trash planet to do security sweeps is ridiculously vague. For advanced troops to be used on such a detail would be a waste given that the same Col made a big deal of showing how good they are for combat. It would seem more likely they would use the older troops to do trash security sweeps. Instead they demoted them to be used for setting up monitoring stations and even tell them they don't have to salute.
Sending waste to another planet is inefficient and costly.
The advanced troops on the trash planet are wearing breathing devices with gas masks, limiting their ability to see and reducing their combat effectiveness. There is no need for these devices on a planet with oxygen.
On such a desert planet, dead bodies would be used as fertilizer and not buried in a cemetery.
Gary Busey's character is called 'Captain', but the insignia pin on his collar signifies the rank of Chief Warrant Officer 2.
When the newer, more elite soldiers are introduced, just before the camera pans to the left, the soldier on the end breaks character and begins to smile.
When Caine is calling for the second crawler to move near him, not knowing Todd had taken it over, he calls for it to take a '9 o'clock' position which should be directly to his left like on a clock face. He says that the crawler is not as directed and is on a collision course from 12 o'clock which would be from straight ahead, but Todd hits him broadside from the left. This actually is the 9 o'clock position.